Ethylene Cracking Patent Technology Provider & Its Process Characteristics

At present, the main technical routes for cracking ethylene are: using tube furnace steam cracking technology for cracking; using sequential separation process, pre-deethanization pre-hydrogenation process and pre-depropanization pre-hydrogenation process for separation.

The world's famous ethylene patent technology companies include Lummus, S&W, KBR, Linde, TPL/KTI, etc. The technologies of each company are mature and reliable technologies, and there are world-scale ethylene plants in operation, but there are differences in technical details.

The separation process of Lummus company is sequential separation; the separation process of Linde company is pre-deethanization and pre-hydrogenation separation; the TPL company of Technib Group uses asymptotic separation process; S&W company, KB company and domestic ST technology are all Hydrogenation separation process before depropanization.

PART 1. LUMMUS

Lummus' ethylene production technology occupies an important position in the ethylene industry, and its olefin plant design experience has more than 50 years of experience.

At present, the total production capacity of Lummus' production technology exceeds 40 million tons, accounting for about 30% of the world's total ethylene production capacity.

The main features of the process are as follows:

(1) SRT series cracking furnace is used, which has high thermal efficiency and strong adaptability to raw materials. It is suitable for both light raw materials and heavy raw materials, with high ethylene yield;

(2) The quenching area is equipped with a pan oil circulation and viscosity reduction system, which can effectively reduce the viscosity of the quenching oil in the gasoline fractionation tower tower kettle and increase the kettle temperature;

(3) The separation process adopts sequential separation and low-pressure demethanization;

(4) Using binary and ternary mixed refrigeration technology, ternary refrigeration can reduce the number of equipment and investment;

(5) Hydrogenation of propyne/propadiene by new catalytic distillation technology;

(6) The low pressure propylene distillation column and the propylene machine form a heat pump.

PART 2. S&W

S&W is one of the famous ethylene patent dealers. There are more than 130 sets of ethylene plants in the world using S&W technology, and its production capacity accounts for 30% of the world's total ethylene production capacity.

The main features of the process are as follows:

(1) USC (super-selective) cracking furnace: high thermal efficiency of 93% to 94%; suitable for both light and heavy raw materials; high olefin yield; long furnace tube life.

(2) SLE (select linear heat exchanger) quench boiler: minimum volume; short residence time; very low coking, no need for off-line coking.

(3) The quench oil viscosity is adjusted by the ethane furnace cracking gas stripping, which solves the difficult problem of quench oil viscosity control.

(4) HRS (heat integrated rectification system): combination of heat integration and component rectification; adopt heat pump technology to reduce energy consumption; reduce refrigerant consumption; Methane; lower investment, increased competitiveness with other processes.

PART 3. KBR

KBR is the merger of Kellogg and B&R.

The original Kellogg company's ethylene technology is characterized by the use of millisecond cracking furnaces and sequential separation processes; B&R's separation technology uses pre-deethanization and pre-hydrogenation technology for gas cracking raw materials, and pre-depropanization and pre-hydrogenation technology for liquid cracking materials.

The characteristics of KBR ethylene technology are as follows:

(1) Cracking technology: wide adaptability of raw materials, various raw materials such as ethane-VGO can be used; single-pass furnace tube, short residence time and high yield; different raw materials can be cracked in different zones; online coke cleaning can be used to prolong the online rate of operation.

(2) The quench oil system has viscosity control measures.

(3) Separation technology: pre-deethanization and pre-hydrogenation process (gas raw material); pre-depropanization and pre-hydrogenation process (liquid raw material); the deethanizer can produce 30% of the output of ethylene; the ethylene tower and the ethylene machine form a heat pump System; propylene tower and propylene machine form a heat pump.

PART 4. LINDE

Linde is a well-known ethylene industry company with expertise in cryogenics and air separation.

In terms of ethylene production technology: the world's first plant to produce ethylene by cryogenic separation was built by Linde Company in 1931; Separation and other technologies were built in 1965.

The main features of the process are as follows:

(1) Features of cracking furnace: It is unique in the design of cracking furnace; it is suitable for heavy cracking materials with diesel oil and hydrogenation tail oil as raw materials; secondary steam injection technology; radiation section can be single furnace or double furnace.

(2) Characteristics of separation process: pre-deethane; carbon two hydrogenation adopts pre-hydrogenation, isothermal reactor; ethylene rectification tower adopts heat pump system; acetylene can be recovered by solvent absorption method.

PART 5. TPL/KTI

The technology quoted by TPL/KTI is TOPKIN technology. TOPKIN technology is composed of GK cracking furnace of KTI Company of the Netherlands and TPL progressive separation technology of Desineb Group.

KTI company has its own characteristics in the design of cracking furnace. Its cracking furnace is GK type and has the world's only commercial productivity prediction software SPYRO. KTI company developed and designed the advanced GK-V type cracking furnace by using SPYRO software and its own experience.

GK-V type cracking furnace is a two-pass furnace tube, the first pass has a larger specific surface area, and the second pass has a larger flow area, which is conducive to reducing the partial pressure of hydrocarbons. In this way, the thermal strength of the pipe wall in the heating section can be improved, the residence time of the reactants can be reduced, the partial pressure of hydrocarbons can be reduced, and the yield of olefins can be improved.

TPL's progressive separation technology achieves separation goals with minimal energy consumption. The basic principle is that the adjacent components are not completely separated, and the components that are far apart are completely separated. In order to achieve the ideal separation sequence, a multi-step separation method is adopted. In the asymptotic separation process, in order to reduce the power of compression and refrigeration, combined with the characteristics of the process, medium-pressure double-column demethanization is adopted.